Which of the following is not criterion for essentiality of an element?

Options

A. The element must be absolutely necessary for supporting normal growth and reproduction.
B. The requirement of the element must be specific and not replaceable by another element.
C. The element must be directly involved in the metabolism of the plant.
D. The requirement of the element are replaceable by another element.

Answer

D

Explanation

The requirement of the element are not replaceable by another element.